Simon's 3 way horn loaded mid top

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 soundguymatt wrote:

Anyone care to spec drivers and do some plots for this design - looks like you could be onto something. 

Building plans has been released for this community in the hope that will start collaboration between forum members.

I wish my time and resources would not have limits to revisit and entertain continuously this and other designs.

As per the request the 10" /8"/1" version will be build for the school students.

 imageoven wrote:

Do you plan to make the horns from fibreglass or wood?
You show a phase bung in the plans, how far along is it's design?

This
is wood horn. Long ago when I made fiberglass horns, I use to reverse a
dust cap on the driver, then pour a gypsum plaster, let it cure and use
it to make a negative mold form to specifically custom make center
phase plug for that driver.

Plan above is for a general horn to cover mid range, can be built from
wood and to benefit most DIY members here instead of posting a building
plan for fiberglass mold plan for very specific driver.  

 Ibex wrote:

Looks a little bit like a mini KF-850...

Horn
calculations have not changed formulas remain the same. Because of
given constants most horns meant for general parameter drivers will end
up to be much less similar. 

Since horns been used in sound reinforcement it's getting hard to have fresh ideas, most designs are  exhausted and we have a feeling some have been repeated. 

That's the case on my first post when other member pointed out. it looks like a mini version of the EAW KF 850 !

Remember a complex system that works is
invariably found to have evolved from a simple system that works.

 amss wrote:

What are the recommended drivers? Any plots?

To get the most efficiency and smooth frequency response customized horn need to be designed to each individual specific driver.

Sourcing and selecting a driver can take longer than a design process. 

With 10" and 12" we can get to about 2 kHz before it gets too 
tricky... Tony Andrews from Funktion One gets 6,5 kHz from a horn-loaded 8", but he use 
custom drivers and their R&D is way better than any of us, DIY-s, 
can dream about...

 Centauri wrote:

What I had in mind for the HF would not change box dimensions

Thank
you for your interest and I appreciate for your time to make up a
sketch. I agree that will improve a bit the sounding to relocate the HF horn. 
Considering that this cabinet is for long range listening. It's debatable how much will improve?

Unfortunately whenever two wavelengths with different pressures are combined, there will be a discontinuity at the juncture of the two.

This discontinuity will be audible as though it were a separate, 
non-coherent source ( like delayed loudspeaker).

In my opinion shifting or incorporating in the mid horn a HF horn is rather done for space saving reason. (Note this theory is not the case in pin-pointed Line Array system)

In respect to the fact that is doable to relocate HF horn where your sketch is showing, make a cut out on two wooden horns into cabinet cross support plate.

I wouldn't mind to hear others opinion how beneficial and practical this would be.

My understanding of your first response was to change the cabinet height to fit HF horn between the mid horns and port the rear chamber either side of the HF flare for a little more low end extension. On picture you missing the ports, right?